Sadly, heterosexuals, most claiming to be “Christians” killed marriage long ago by abandoning clear, biblical teaching on divorce and especially divorce and remarriage. The homosexuals are simply dancing and urinating on marriage’s grave.
IMHO, given the current divorce laws, in most states, (passed by a “Christian” nation), no Bible believing church should marry ANY couple without a pre-nuptial agreement, holding both parties to biblical standards of marriage and divorce. Any couple that marries without such an agreement should be treated, by the church, as unmarried and as fornicators, living in sin.
I always thought gay marriage as odd but not a greater threat to marriage than the cursed family courts. A man is often forced to pay child support to children that are not his; no penalty, punishment, or safe-guards against cuckoldry. It seems cuckoldry (aka paternity fraud) is a protected activity of the courts.